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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 232

post #3466 of 3639

10 ohm resistor + 32 ohm headphone = 7.6 ohms. 10 ohm resistor + 600 ohm headphone = 9.8ohms. Both will work fine with any tube amp designed for an 8 ohm load.

post #3467 of 3639
Quote:
Originally Posted by lugnut View Post
 

Just wondering has anyone else received any information from Brunk, about the Robinett Box ? Thanks

 

 

Quote:
Originally Posted by punit View Post
 

Nope not yet. Haven't received any reply to my mails / pm's . Which is very unlike him, hope everything is all right with him.

 

Me too.  I haven't heard anything either and sent an email/pm's.  Hope everything is ok.

post #3468 of 3639

I sent brunk a pm too with no response so far.

post #3469 of 3639

I added 8 ohm resistors to my tube amp speaker taps today, and it cleared up the distortion/osculation sounds I was getting in some of the lower mid vocals.  Whew, tried different tubes, cables headphones, and I though I damaged components.  Every thing sounds fine, very good now, clean background, same good sound from my music!  Thanks for the insight in this thread @robrob!

post #3470 of 3639

I'm glad it's working for you cute, but 10 ohm resistors would be a better match. 8 ohm resistors + 32 ohm headphones = 6.4 ohms of effective speaker load. Not low enough to do any harm but the cost of two 10 ohm resistors is just so low. . .

post #3471 of 3639
Quote:
Originally Posted by robrob View Post
 

I'm glad it's working for you cute, but 10 ohm resistors would be a better match. 8 ohm resistors + 32 ohm headphones = 6.4 ohms of effective speaker load. Not low enough to do any harm but the cost of two 10 ohm resistors is just so low. . .

 

I couldn't find the 10 ohm;, I was in a hurry, so Amazon Prime was my alternative.  I had to settle for the cement, with short legs.  Now that I know the results, I can look for some of the black wire wound, or the pink in your picture.  Anyone have a link to either one of the two, 10 ohm, 10 watt? 

post #3472 of 3639

Where would one buy wire-wound, non-inductive resistors? Even better if the vendor is in Canada, or at least the USA. The sites I've been to are vague about the non-inductive part. How important is this feature?

post #3473 of 3639

This a 10ohm 10watt 1% wirewound axial resistor for $1.74 each + shipping from Mouser.com 

 

Ohmite 40F10RE

 

http://www.mouser.com/ProductDetail/Ohmite/40F10RE/?qs=sGAEpiMZZMukHu%252bjC5l7YSNDdmoxLywgnEpqy8GgOKY%3d

 

You could get by with a 5watt resistor for your low power tube amp but the 10watt will work fine and also be good for a higher power amp in the future. If you do want a 5watt then search on mouser for "10ohm 5watt 1% resistor"

post #3474 of 3639
Quote:
Originally Posted by robrob View Post
 

This a 10ohm 10watt 1% wirewound axial resistor for $1.74 each + shipping from Mouser.com 

 

Ohmite 40F10RE

 

http://www.mouser.com/ProductDetail/Ohmite/40F10RE/?qs=sGAEpiMZZMukHu%252bjC5l7YSNDdmoxLywgnEpqy8GgOKY%3d

 

You could get by with a 5watt resistor for your low power tube amp but the 10watt will work fine and also be good for a higher power amp in the future. If you do want a 5watt then search on mouser for "10ohm 5watt 1% resistor"

 

Thanks, I'm on it!

post #3475 of 3639
Quote:
Originally Posted by Velomane View Post
 

Where would one buy wire-wound, non-inductive resistors? Even better if the vendor is in Canada, or at least the USA. The sites I've been to are vague about the non-inductive part. How important is this feature?

 

For a Canada-based vendor try Parts Connexion. Very friendly, easy to deal with and open to questions. Bought Mills resistors for my tube amp from there.

post #3476 of 3639
Quote:
Originally Posted by robrob View Post
 

I sent brunk a pm too with no response so far.

 

hmm...that's weird...

 

I remember Brunk mentioning that he was doing a run of 15...has anyone heard anything?  That was 2 months ago now.

post #3477 of 3639
Quote:
Originally Posted by DaemonSire View Post
 

 

hmm...that's weird...

 

I remember Brunk mentioning that he was doing a run of 15...has anyone heard anything?  That was 2 months ago now.

Hmm, yes, that's weird. Should we be worried?...

post #3478 of 3639

To be fair, on his last PM to me, he stated that the work on the Boxes had only started on the 13th of March, due to delays on the delivery of speaker terminals. That makes it less than a month ago, so...:confused_face_2:

post #3479 of 3639

I've read the bulk of this thread and I finally have a clear picture in my head of the different options.

 

My question is this: Why are the headpone outputs of integrated amps not already set up this way?  If it is so cheap and sounds so good, what is it that makes manufacturers do something different?

 

I opened up my arcam alpha 10 to take a look at the headpone socket, and all I see are 4 resistors.  Am I really doing anything different that what is already done inside the case by using the speakers taps?

 

The arcam alpha 10 is 100+ wpc in 8 ohms, can anyone guess as to how much attenuation I will need when driving a pair of audeze lcd-2?  Would it be safe to hook them up without?

 

(Additional none related query below)

 

 

Something that has been bugging me is that when people talk about the power requirements of headpones, they talk about the amount of power required to make a certain headphone reach a certain db.  Is this an average figure taken accross all frequencies, because I thought lower frequencies required more power? 

 

When somebody says x amount of power will produce y db output on these headphones, then in theory, could that not be true for the lower frequencies?

 

The reason I ask here is I wonder if this could be the reason that driving headphones from powerful speaker amps produces favourable results.

 

Cheers,

Andy

post #3480 of 3639
Quote:
Originally Posted by hpandy View Post

 

 

Something that has been bugging me is that when people talk about the power requirements of headpones, they talk about the amount of power required to make a certain headphone reach a certain db.  Is this an average figure taken accross all frequencies, because I thought lower frequencies required more power? 

 

When somebody says x amount of power will produce y db output on these headphones, then in theory, could that not be true for the lower frequencies?

 

The reason I ask here is I wonder if this could be the reason that driving headphones from powerful speaker amps produces favourable results.

 

Cheers,

Andy


Sensitivity is usually measured relative to 1000 Hz. It will definitely vary across frequencies, and the variation depends on the headphone's impedance curve. As far as I know, many headphones have an impedance peak somewhere in the bass frequencies due to driver resonance, so that peak would require more power. 

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